Lowercase some errors

This commit is courtesy of

```
for f in $(git ls-files *.go | grep -v ^vendor/); do \
	sed -i 's/\(errors\..*\)"Error /\1"error /' $f;
done

for f in $(git ls-files *.go | grep -v ^vendor/); do \
	sed -i 's/\(errors\..*\)"Failed to /\1"failed to /' $f;
done

```

etc.

Self-reviewed using `git diff --word-diff`, found no issues.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/libpod/container_internal_linux.go b/libpod/container_internal_linux.go
index 2f107446f..894982973 100644
--- a/libpod/container_internal_linux.go
+++ b/libpod/container_internal_linux.go
@@ -919,7 +919,7 @@ func (c *Container) checkpoint(ctx context.Context, options ContainerCheckpointO
 func (c *Container) importCheckpoint(input string) error {
 	archiveFile, err := os.Open(input)
 	if err != nil {
-		return errors.Wrap(err, "Failed to open checkpoint archive for import")
+		return errors.Wrap(err, "failed to open checkpoint archive for import")
 	}
 
 	defer archiveFile.Close()
@@ -1116,11 +1116,11 @@ func (c *Container) restore(ctx context.Context, options ContainerCheckpointOpti
 			// Only do this if a rootfs-diff.tar actually exists
 			rootfsDiffFile, err := os.Open(rootfsDiffPath)
 			if err != nil {
-				return errors.Wrap(err, "Failed to open root file-system diff file")
+				return errors.Wrap(err, "failed to open root file-system diff file")
 			}
 			defer rootfsDiffFile.Close()
 			if err := c.runtime.ApplyDiffTarStream(c.ID(), rootfsDiffFile); err != nil {
-				return errors.Wrapf(err, "Failed to apply root file-system diff file %s", rootfsDiffPath)
+				return errors.Wrapf(err, "failed to apply root file-system diff file %s", rootfsDiffPath)
 			}
 		}
 		deletedFilesPath := filepath.Join(c.bundlePath(), "deleted.files")
@@ -1128,17 +1128,17 @@ func (c *Container) restore(ctx context.Context, options ContainerCheckpointOpti
 			var deletedFiles []string
 			deletedFilesJSON, err := ioutil.ReadFile(deletedFilesPath)
 			if err != nil {
-				return errors.Wrapf(err, "Failed to read deleted files file")
+				return errors.Wrapf(err, "failed to read deleted files file")
 			}
 			if err := json.Unmarshal(deletedFilesJSON, &deletedFiles); err != nil {
-				return errors.Wrapf(err, "Failed to read deleted files file %s", deletedFilesPath)
+				return errors.Wrapf(err, "failed to read deleted files file %s", deletedFilesPath)
 			}
 			for _, deleteFile := range deletedFiles {
 				// Using RemoveAll as deletedFiles, which is generated from 'podman diff'
 				// lists completely deleted directories as a single entry: 'D /root'.
 				err = os.RemoveAll(filepath.Join(c.state.Mountpoint, deleteFile))
 				if err != nil {
-					return errors.Wrapf(err, "Failed to delete file %s from container %s during restore", deletedFilesPath, c.ID())
+					return errors.Wrapf(err, "failed to delete file %s from container %s during restore", deletedFilesPath, c.ID())
 				}
 			}
 		}